Canada



.Bum 24; 93@ A. Hummm Erm, L'l l l METHOD OF MAKING SHREDERS Filed ost, 21; 192@ wlo.

Vtrate Patented June 24, 1930 l.

UNITED? s 'rMEsv ALBEnT n. Dixon' AND. THoNAs SIMPSON aoBsoN, or SEATTLE, WASHINGTON, um

FERDINAND n HnNsHELL, or vANcoUv-nn, BRITISH convenu, 'oANnDA ,METHOD or MAKINGV snnnnpnas Application tiled Uctober 21, 1929'. Serial No. 401,288.

This invention relates to a method of forming cutting teeth in a vegetable and. fruitshredder or the like, the general object of the invention being to form the teeth with beveled cutting edges, so that the teeth will cut articles with the minimum amount of resistance.

Another object of the. invention is to so arrange the parts that they canbe formed by dies.

vThis invention also consists in certain other features of construction and in the combination and arrangement of the several parts to be hereinafter fullyrv described, illusd inthe accompanying drawing and specifically pointed out in the appended claims. l v

in describing the invention in detail, reference will be had to the accompanying drawing wherein like characters denote like or correspondin parts throughout the sev eral views, and 1n which j Figure l is a sectional view showing the rst part of the unching operation for -orming hole and eveling the cutting edge of a tooth to be formed on a member.

Figaro 2 a similar view showing the compiet' n the operation.

Figure. is a view of t* tion.

' Figure i is sectionai View showing how the metal is pressed adjacent the hole previously formed therein to form the tooth.

Asbeiore stated, this invention relates primarily to the formation ofthe teeth and reinforced ed es oi a shredder device, such as that formin the subject matter oi an .application file on October 21', 1929, Serial No. 401,269, though, of course, the inven, tion is not limited to this use. The rst step of forming each tooth in the metal n 4 ne ,noie beveled part termed-oy before mentioned opera the metal v.Bassum and bends a portion of the metal over the beveled enlargement 3 and las the punch passes through the metal, it cuts that portion which is bent over the enlargement 3 at an an le as shown in Figure 2, so that the Wal of this bent ortion is beveled. Thenl the metal is place on a'female die 6 having a recess 7 therein which gradually increases in de th from the point 8, where it merges into t e, top surface of. the die to the straight wall 9, the recess beinv of curved shape in cross section. The m e die 10 has its op'- erative end oppositely formed so as to conform to the shape of the recess, 'and these dies presspthe metal adjacent the opening into a tooth forming portion of arc shape in cross section with its cutting edgeterminating at the opening andas the metal is pressed'by the dles, the bent part previously ormed by the other two dies is'straightened out into apart of the tooth forming portion and its edge is so positioned as to increase. the bevel, as shown in` Figure d. Thus a raised part is formed on the metal sheet havu ing a beveled edge terminating at the openin so aste :form a tooth,` as shown in the be ore mentioned application.

it is thought from the foregoing descripn tion thatthe advantages and nove features of the invention will be readil apparent. it is to be understood that c an es mayhe made in the construction and in t e com,- bination and arrangement et the several parts, provided that such changes iall withiny the scope of the appended claims.

at we claim 1s:- l. The herein described method of torming teeth on a sheet of material consisting in punching a hole in the sheet and bending' a portion of the sheet adjacent the hole at an angle so that that part of the .wall of the hole in said bentportionv vis beveled,

then pressing the sheet at one side of the hole loutwardly beyond the plane. of the sheet whereby the bent portion is bent and forms part of t e outwardly bent portion so as to produce a tooth having a' beveled edge. 2. 'The herein described method of forming teeth in a sheet of material consisting.

in placing the sheet on a die having an'o eningl therein, the up er end of whic is formed with a bevele) enlargement and then pressing the punching die through the metal lnto the opening, whereby a portion of the metal will be bent against the beveled enlargement and then the metal cut to provide an opening, the wall of which that is contained in the bent part being beveled and then placing the sheet between two other dies to press the metal at one side of the opening into a tooth, the cutting edge of which is formed by the before mentioned.

beveled wall of the opening.

In testimony whereof we alix our signatures. ALBERT H. DIXON.

THOMAS SIMPSON ROBSON. FERDINAND A. HENSCHELL. 

